>Wow...those were the days. I vividly remember building the
>conduction-cooled SB-230 when I was a sophomore in high school. It was my
>vocational project that year, and I received an "A" from my EE instructor.
>
>I know I abused the hell out of that amp. I never used ALC with my FT-101EE
>and consistently drove it into electrical regions never attempted by
>rational, modern man. I used it for four years, then sold it with emission
>every bit as good as new. As far as I can recall, I never had a single
>episode of arcing or another type of failure with it, despite my deliberate
>abuse <g>.
>
Did use a VHF parasitic-oscillation suppressor in the anode? Did you use
an Eimac grid-grounding collet for the 8873?
>Now, close to 25 years later I have an Alpha 77DX. I don't abuse this amp
>in any respect. In fact, I baby the hell out of it. It too, has been good
>to me without any trouble ever since I purchased it from the last export lot
>around 1990 or so. Knock on wood: am I the only lucky one out there to be
>blessed with "perfect" amplifiers?
>
- The RF-actuated bias scheem in the 77, which allows the 8877 to switch
bias into the non-linear region during voice transmissions, could hardly
be called a 'perfect' design.
- Using a coupling-type capacitor for the 160m tuned circuit padder C is
seemingly not a perfectly good idea. .
Rich---
R. L. Measures, 805-386-3734, AG6K
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